<template>
  <div>
    <div v-for="(item, index) in arr" :key="index" class="box">
      <input type="checkbox" :value="item" v-model="num">{{ item }}
    </div>
    <p>你选中的元素, 累加的值和为: {{ total }} </p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      num:[]
    };
  },
  computed:{
    total(){
      return this.num.reduce((sum,val)=>{
        return sum+=val
      },0)
    }
  },
  methods: {
  },
};
</script>
<style>
  .box{
    display: inline-block;
  }
</style>
